/* Modern Professional Design System */

/* CSS Custom Properties (Design Tokens) */
:root {
  /* Colors */
  --primary-50: #f0f9ff;
  --primary-100: #e0f2fe;
  --primary-500: #0ea5e9;
  --primary-600: #0284c7;
  --primary-700: #0369a1;
  --primary-900: #0c4a6e;
  
  --neutral-50: #f8fafc;
  --neutral-100: #f1f5f9;
  --neutral-200: #e2e8f0;
  --neutral-300: #cbd5e1;
  --neutral-400: #94a3b8;
  --neutral-500: #64748b;
  --neutral-600: #475569;
  --neutral-700: #334155;
  --neutral-800: #1e293b;
  --neutral-900: #0f172a;
  
  --accent-500: #3b82f6;
  --accent-600: #2563eb;
  
  --success-500: #10b981;
  --warning-500: #f59e0b;
  --error-500: #ef4444;
  
  /* Typography */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  --font-display: 'Inter', system-ui, sans-serif;
  
  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;
  
  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
  
  /* Transitions */
  --transition-fast: 150ms ease-out;
  --transition-normal: 300ms ease-out;
  --transition-slow: 500ms ease-out;
}

/* Reset and Base Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: var(--font-primary);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--neutral-700);
  background-color: #ffffff;
  font-feature-settings: 'kern' 1, 'liga' 1;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--spacing-xl);
}

/* Modern Header */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--neutral-200);
  z-index: 1000;
  transition: all var(--transition-normal);
}

.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-lg) 0;
}

.logo h1 {
  font-family: var(--font-display);
  font-size: 1.625rem;
  font-weight: 700;
  color: var(--neutral-900);
  letter-spacing: -0.025em;
  margin: 0;
}

.logo::before {
  content: '';
  display: inline-block;
  width: 2rem;
  height: 2rem;
  background: linear-gradient(135deg, var(--primary-500) 0%, var(--accent-600) 100%);
  border-radius: var(--radius-md);
  margin-right: var(--spacing-sm);
  vertical-align: middle;
  position: relative;
}

.logo::after {
  content: '✓';
  position: absolute;
  left: 0.5rem;
  top: 0.25rem;
  color: white;
  font-size: 0.875rem;
  font-weight: 600;
}

.nav-links {
  display: flex;
  gap: var(--spacing-2xl);
  align-items: center;
}

.nav-links a {
  text-decoration: none;
  color: var(--neutral-600);
  font-weight: 500;
  font-size: 0.925rem;
  transition: color var(--transition-fast);
  position: relative;
  padding: var(--spacing-sm) 0;
}

.nav-links a:hover {
  color: var(--primary-600);
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--primary-500), var(--accent-600));
  transition: width var(--transition-normal);
  border-radius: 1px;
}

.nav-links a:hover::after {
  width: 100%;
}

/* Hero Section - Modern Corporate */
.hero {
  background: linear-gradient(135deg, var(--neutral-900) 0%, var(--neutral-800) 100%);
  color: white;
  padding: 140px 0 100px;
  text-align: center;
  margin-top: 80px;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: 
    radial-gradient(circle at 20% 80%, rgba(59, 130, 246, 0.15) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(14, 165, 233, 0.15) 0%, transparent 50%);
}

.hero-content {
  position: relative;
  z-index: 1;
}

.hero-content h1 {
  font-family: var(--font-display);
  font-size: 3.5rem;
  font-weight: 800;
  margin-bottom: var(--spacing-lg);
  line-height: 1.1;
  letter-spacing: -0.025em;
  background: linear-gradient(135deg, #ffffff 0%, #e2e8f0 100%);
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-content p {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-2xl);
  opacity: 0.9;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
  font-weight: 400;
  line-height: 1.7;
}

.cta-button {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  background: linear-gradient(135deg, var(--primary-500) 0%, var(--accent-600) 100%);
  color: white;
  padding: 1rem 2rem;
  text-decoration: none;
  border-radius: var(--radius-lg);
  font-weight: 600;
  font-size: 1rem;
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-lg);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.cta-button:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-xl);
  background: linear-gradient(135deg, var(--primary-600) 0%, var(--accent-500) 100%);
}

.cta-button::after {
  content: '→';
  transition: transform var(--transition-fast);
}

.cta-button:hover::after {
  transform: translateX(4px);
}

/* Articles Section - Modern Grid */
.articles-section {
  padding: 120px 0;
  background: var(--neutral-50);
}

.articles-section h2 {
  text-align: center;
  font-family: var(--font-display);
  font-size: 2.75rem;
  font-weight: 700;
  margin-bottom: var(--spacing-3xl);
  color: var(--neutral-900);
  letter-spacing: -0.025em;
}

.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(380px, 1fr));
  gap: var(--spacing-2xl);
}

.article-card {
  background: white;
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: all var(--transition-normal);
  border: 1px solid var(--neutral-200);
  position: relative;
}

.article-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
  border-color: var(--neutral-300);
}

.article-image {
  height: 240px;
  background: linear-gradient(135deg, var(--neutral-800) 0%, var(--neutral-700) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.article-image::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: 
    radial-gradient(circle at 30% 70%, rgba(59, 130, 246, 0.2) 0%, transparent 50%),
    radial-gradient(circle at 70% 30%, rgba(14, 165, 233, 0.2) 0%, transparent 50%);
}

.placeholder-image {
  font-size: 4rem;
  color: white;
  opacity: 0.8;
  position: relative;
  z-index: 1;
}

.article-content {
  padding: var(--spacing-2xl);
}

.article-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-lg);
  flex-wrap: wrap;
  gap: var(--spacing-sm);
}

.category {
  background: var(--primary-100);
  color: var(--primary-700);
  padding: 0.375rem 0.75rem;
  border-radius: var(--radius-md);
  font-size: 0.8125rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.025em;
}

.date {
  color: var(--neutral-500);
  font-size: 0.875rem;
  font-weight: 500;
}

.reading-time {
  color: var(--neutral-500);
  font-size: 0.875rem;
  padding: 0.375rem 0.75rem;
  background: var(--neutral-100);
  border-radius: var(--radius-md);
  font-weight: 500;
}

.article-content h3 {
  font-family: var(--font-display);
  font-size: 1.375rem;
  font-weight: 700;
  margin-bottom: var(--spacing-md);
  color: var(--neutral-900);
  line-height: 1.3;
  letter-spacing: -0.025em;
}

.article-content p {
  color: var(--neutral-600);
  margin-bottom: var(--spacing-lg);
  line-height: 1.6;
  font-size: 0.9375rem;
}

.author-mini {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-lg);
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--neutral-200);
}

.author-avatar-mini {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary-500) 0%, var(--accent-600) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.875rem;
  color: white;
  font-weight: 600;
}

.author-name-mini {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--neutral-700);
}

.read-more {
  color: var(--primary-600);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.9375rem;
  transition: color var(--transition-fast);
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.read-more:hover {
  color: var(--primary-700);
}

.read-more::after {
  content: '→';
  transition: transform var(--transition-fast);
}

.read-more:hover::after {
  transform: translateX(2px);
}

/* Resources Section */
.resources-section {
  padding: 120px 0;
  background: white;
}

.resources-section h2 {
  text-align: center;
  font-family: var(--font-display);
  font-size: 2.75rem;
  font-weight: 700;
  margin-bottom: var(--spacing-3xl);
  color: var(--neutral-900);
  letter-spacing: -0.025em;
}

.tips-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-2xl);
}

.tip-card {
  text-align: center;
  padding: var(--spacing-2xl);
  background: var(--neutral-50);
  border-radius: var(--radius-xl);
  transition: all var(--transition-normal);
  border: 1px solid var(--neutral-200);
  position: relative;
  overflow: hidden;
}

.tip-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary-500), var(--accent-600));
}

.tip-card:hover {
  border-color: var(--primary-300);
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  background: white;
}

.tip-icon {
  font-size: 3rem;
  margin-bottom: var(--spacing-lg);
  display: block;
}

.tip-card h3 {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: var(--spacing-md);
  color: var(--neutral-900);
  letter-spacing: -0.025em;
}

.tip-card p {
  color: var(--neutral-600);
  line-height: 1.6;
  font-size: 0.9375rem;
}

/* Footer */
.footer {
  background: var(--neutral-900);
  color: white;
  padding: 80px 0 40px;
  position: relative;
}

.footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--primary-500), transparent);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-2xl);
  margin-bottom: var(--spacing-2xl);
}

.footer-section h3,
.footer-section h4 {
  margin-bottom: var(--spacing-lg);
  color: white;
  font-weight: 700;
}

.footer-section h3 {
  font-family: var(--font-display);
  font-size: 1.375rem;
}

.footer-section p {
  color: var(--neutral-400);
  line-height: 1.6;
  margin-bottom: var(--spacing-lg);
}

.footer-section ul {
  list-style: none;
}

.footer-section ul li {
  margin-bottom: var(--spacing-sm);
}

.footer-section ul li a {
  color: var(--neutral-400);
  text-decoration: none;
  transition: color var(--transition-fast);
  font-weight: 500;
}

.footer-section ul li a:hover {
  color: var(--primary-400);
}

.report-button {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  background: linear-gradient(135deg, var(--error-500) 0%, #dc2626 100%);
  color: white;
  padding: 0.75rem 1.5rem;
  text-decoration: none;
  border-radius: var(--radius-lg);
  font-weight: 600;
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-md);
}

.report-button:hover {
  background: linear-gradient(135deg, #dc2626 0%, #b91c1c 100%);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.footer-bottom {
  border-top: 1px solid var(--neutral-800);
  padding-top: var(--spacing-xl);
  text-align: center;
}

.footer-bottom p {
  color: var(--neutral-500);
  margin: 0;
  font-size: 0.875rem;
}

/* Responsive Design */
@media (max-width: 1024px) {
  .container {
    padding: 0 var(--spacing-lg);
  }
  
  .articles-grid {
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-xl);
  }
}

@media (max-width: 768px) {
  .nav {
    flex-direction: column;
    gap: var(--spacing-lg);
    padding: var(--spacing-md) 0;
  }

  .nav-links {
    gap: var(--spacing-lg);
  }

  .hero {
    padding: 120px 0 80px;
  }

  .hero-content h1 {
    font-size: 2.5rem;
  }

  .hero-content p {
    font-size: 1.125rem;
  }

  .articles-section,
  .resources-section {
    padding: 80px 0;
  }

  .articles-section h2,
  .resources-section h2 {
    font-size: 2.25rem;
  }

  .articles-grid {
    grid-template-columns: 1fr;
  }

  .tips-grid {
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  }

  .footer-content {
    grid-template-columns: 1fr;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 var(--spacing-md);
  }

  .hero {
    padding: 100px 0 60px;
  }

  .hero-content h1 {
    font-size: 2rem;
  }

  .articles-section,
  .resources-section {
    padding: 60px 0;
  }

  .article-content,
  .tip-card {
    padding: var(--spacing-lg);
  }

  .footer {
    padding: 60px 0 30px;
  }
}

/* Accessibility & Focus States */
a:focus,
button:focus {
  outline: 2px solid var(--primary-500);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* Smooth scroll behavior */
html {
  scroll-behavior: smooth;
}

/* Performance optimizations */
.article-card,
.tip-card {
  will-change: transform;
}

/* Modern loading states */
@keyframes shimmer {
  0% { background-position: -200px 0; }
  100% { background-position: calc(200px + 100%) 0; }
}

.loading {
  background: linear-gradient(90deg, var(--neutral-200) 0px, var(--neutral-100) 40px, var(--neutral-200) 80px);
  background-size: 200px 100%;
  animation: shimmer 1.5s linear infinite;
}

/* Modern scrollbar */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--neutral-100);
}

::-webkit-scrollbar-thumb {
  background: var(--neutral-400);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--neutral-500);
}